Workarround to allow downloaded file sharing between jenkins-slave and selenium containers

_README.md

Docker-compose : Jenkins + Selenium grid

Why ?

When using Jenkins and Selenium grid on a Docker stack components are isolated. So it could be quite hard to find and read downloaded file by a test case.

The workarround is to override selenium images to set user id equals to jenkins user id and share /dev/shm mount point between containers.

Usage

Tu use this Gist you must set your selenium test cases to check downloaded files located in /dev/shm/

docker-compose -f docker-compose up --bulid

docker-compose.yml

version: '3'

services:
  jenkins:
    image: jenkinsci/slave
    volumes:
      - /dev/shm:/dev/shm:rw
  
  selenium-hub:
    image: mycompany/selenium-hub
    build:
      context: .
      dockerfile: dockerfile
      build-args:
        - image=selenium/hub
        - version=latest
    environment:
      - "GRID_TIMEOUT=60000"
    volumes:
      - /dev/shm:/dev/shm:rw
    networks:
      - selenium
  
  selenium-chrome:
    image: mycompany/selenium-node-chrome
    build:
      context: .
      dockerfile: dockerfile
      build-args:
        - image=selenium/node-chrome-debug
        - version:latest
    environment:
      - "HUB_HOST=selenium-hub"
      - "HUB_PORT_4444_TCP_ADDR=selenium-hub"
    volumes:
      - "/dev/shm:/home/seluser/Downloads:rw"
    networks:
      - selenium
  
networks:
  selenium:

dockerfile

ARG version=latest
ARG image=selenium/hub
FROM ${image}:${version}
USER root
RUN usermod -u 10000 seluser
RUN chown -R seluser:seluser /opt/selenium
USER seluser